Creating Multiple Choice Questions Without using 'Exam' Class

If all you want is to occasionally be able to ask multiple choice questions, then the exam class may be overkill. Here's a complete LaTeX file that defines both a choices environment and a oneparchoices environment, which you can use to list the choices. (I'm assuming here you'd use an enumerate environment to list the questions.)

\documentclass{article}


%--------------------------------------------------------------------
%--------------------------------------------------------------------
\newcounter{choice}
\renewcommand\thechoice{\Alph{choice}}
\newcommand\choicelabel{\thechoice.}

\newenvironment{choices}%
  {\list{\choicelabel}%
     {\usecounter{choice}\def\makelabel##1{\hss\llap{##1}}%
       \settowidth{\leftmargin}{W.\hskip\labelsep\hskip 2.5em}%
       \def\choice{%
         \item
       } % choice
       \labelwidth\leftmargin\advance\labelwidth-\labelsep
       \topsep=0pt
       \partopsep=0pt
     }%
  }%
  {\endlist}

\newenvironment{oneparchoices}%
  {%
    \setcounter{choice}{0}%
    \def\choice{%
      \refstepcounter{choice}%
      \ifnum\value{choice}>1\relax
        \penalty -50\hskip 1em plus 1em\relax
      \fi
      \choicelabel
      \nobreak\enskip
    }% choice
    % If we're continuing the paragraph containing the question,
    % then leave a bit of space before the first choice:
    \ifvmode\else\enskip\fi
    \ignorespaces
  }%
  {}
%--------------------------------------------------------------------
%--------------------------------------------------------------------

%--------------------------------------------------------------------
\begin{document}

\begin{enumerate}
\item One of these things is not like the others; one of these things
  is not the same.  Which one doesn't belong?
  \begin{choices}
    \choice George
    \choice Paul
    \choice John
    \choice Ringo
    \choice Socrates
  \end{choices}
\item What was the color of George Washinton's white horse?
  \begin{choices}
    \choice Green
    \choice Yellow
    \choice White
  \end{choices}
\item One of these things is not like the others; one of these things
  is not the same.  Which one doesn't belong?
  \begin{oneparchoices}
    \choice George
    \choice Paul
    \choice John
    \choice Ringo
    \choice Socrates
  \end{oneparchoices}
\item What was the color of George Washinton's white horse?
  \begin{oneparchoices}
    \choice Green
    \choice Yellow
    \choice White
  \end{oneparchoices}
\item One of these things is not like the others; one of these things
  is not the same.  Which one doesn't belong?

  \begin{oneparchoices}
    \choice George
    \choice Paul
    \choice John
    \choice Ringo
    \choice Socrates
  \end{oneparchoices}
\item What was the color of George Washinton's white horse?

  \begin{oneparchoices}
    \choice Green
    \choice Yellow
    \choice White
  \end{oneparchoices}
\end{enumerate}

\end{document}

If you'd like a smaller indent for the choices environment, you can decrease the \leftmargin.

If you want to put QCM inside a table you have alterqcm, this is a package of TeXLive

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[upright]{fourier}%withot fourier  symb = $\altersquare$
\usepackage{alterqcm}

\parindent0pt
\begin{document}
\begin{alterqcm}[lq=8cm,language=english] 
 \AQquestion{Question}{% 
 {Proposition 1},
 {Proposition 2},
 {Proposition 3}}  
\AQquestion{Question}{% 
 {Proposition 1},
 {Proposition 2},
 {Proposition 3}} 
\end{alterqcm}

\end{document}  

Without "fourier", you need to use a font with the symbol \square or you can use in option symb = $\altersquare$. In the next version, it will be possible to add horizontal answers

You might also want to look at the exercise package (it is not a class). It even allows you to display the answers at the end of a document.